Georgia Tech's Sport Parachute Club

USPA: United States Parachute Associaton

The Skydiver's Enclave: Has a good database listing Drop Zones around the world as well as other info

Dropzone.com: Contains listings of future events, reviews of past events, and info about drop zones around the world

Fusion 4: 4-way RW team, and includes some good World Record CReW pictures